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Any service from third-parties.
It's always have possibility to become a scam, do you know some legit service that turns on to be scammed? We already see that. So, IMO people should be aware of the risks and use the money they can afford to lose.
I doubt they will turn out to be scammers. With the recent spike in on-chain fees, they are trying to take advantage to make a little profit. They sound legit; not vouching for them LOL. I will be using them shortly and won't forget to share a review here so that other users can get help.
So I think wagering $20k for the week to get $5 bonus drops are out of the question for the remainder of the year.

Are you kidding me? That's too low to offer a $5 bonus for $20k wagering LOL. There are a lot of other casinos that offer far better promo AFAIK; although it's not something for me. I hardly have wagered $20k in a month.